Reviewing old jack up rigs in the Middle East

DNVGLMore than 60 per cent of jack ups operating in the Middle East are aged beyond their intended design life

In the wake of recent offshore accidents, oil majors in the region are being very careful in renewing the contracts of these aged units.

Two major oil companies in the region contacted DNV GL’s jack up service centre in Dubai to assess 11 of the aged instruments against their own integrity standards. This will help them to finalise their decision to extend the contracts on these units. They also required DNV GL to recommend necessary actions to keep these units in service for safe operation with less downtime. After the merger, the offshore jack up resources have been strengthened, and the service centre can cater to client needs.

“Our jack up service centre is able to carry out high value technical evaluation services related to jack ups locally in Dubai after combining the expertise of DNV, GL and Noble Denton. For example, in one of the life extension studies, our customer was not able to produce any wave data. Through the experience and database of Noble Denton, we were able to complete the studies,” said M P Bijali, regional offshore manager for Middle East and India for DNV GL.

“We were also able to calculate the fatigue utilisation index of the rigs thanks to Noble Denton’s marine warranty services even though the units’ past operational history was not available from the rig owners. As many rigs are sold and re-sold during the process, operational history is often lost.”

These kinds of services require a multidisciplinary team of specialist engineers in structural, mechanical, electrical and controls, drilling systems and safety systems. DNV GL will recommend the remedial actions to bring these 11 units to an acceptable level. The fatigue life of the structures was assessed as per the company guidelines. The study will help oil majors to assess the condition of the rigs in order to review contract extensions.

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